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Atom-by-atom imaging of moiré transformations in 2D transition metal dichalcogenides : Atom-by-atom imaging of moiré transformations in 2D transition metal dichalcogenides

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Zhang, Yichao; Baek, Ji-Hwan; Lee, Chia-Hao; Jung, Yeonjoon; Hong, Seong Chul; Nolan, Gillian; Watanabe, Kenji; Taniguchi, Takashi; Lee, Gwan-Hyoung; Huang, Pinshane Y.

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American Association for the Advancement of Science
Science Advances, Vol.10 No.13, p. eadk1874
Understanding the atomic-scale mechanisms that govern the structure of interfaces is critical across materials systems but particularly so for two-dimensional (2D) moiré materials. Here, we image, atom-by-atom, the thermally induced structural evolution of twisted bilayer transition metal dichalcogenides using in situ transmission electron microscopy. We observe low-temperature, local conversion of moiré superlattice into nanoscale aligned domains. Unexpectedly, this process occurs by nucleating a new grain within one monolayer, whose crystal orientation is templated by the other. The aligned domains grow through collective rotation of moiré supercells and hopping of 5|7 defect pairs at moiré boundaries. This provides mechanistic insight into the atomic-scale interactions controlling moiré structures and illustrates the potential to pattern interfacial structure and properties of 2D materials at the nanoscale.
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  • College of Engineering
  • Department of Materials Science & Engineering
Research Area 2D materials, 2D crystal structures , 2D materials and fabrication processing, Advanced battery materials, Next-generation electronic devices


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